Book excerpt: The most comprehensive upstream petroleum dictionary ever published. More than 20,000 definitions of words, phrases and abbreviations used in exploration, drilling and production with more than 500 illustrations. Definitions are written for use by both nontechnical and technical readers. Extensive appendices that include charts of drilling rigs and a beam pumper, giant oil and gas fields, United States and Canada geological features, sandstone and limestone classifications, drillstem test symbols, drilling and completion records, and many more.